Media5 Mediatrix 4104, Reference Manual, Page: 374 / 466

Chapter 31 - Troubleshooting General Operation Issues
352 Mediatrix 4104
D
ESCRIPTION
: I changed the IP address of my unit, but I can’t reach the DHCP server anymore.

P
OSSIBLE
C
AUSE
: A subnet mask is used to determine to which subnet an IP address belongs. An IP
address has two components, the network address and the host address. For example, let’s consider
the IP address 192.168.0.1. Assuming this is part of a Class B network, the first two numbers (192.168)
represent the Class B network address, and the second two numbers (0.1) identify a particular host on
this network.
Let’s say you have the following information:
• Mediatrix 4104 IP address: 192.168.0.1
• Subnet Mask: 255.255.0.0 (Class B)
• DHCP Server IP address: 192.168.0.20
If you happen to change the Mediatrix 4104 IP address to 192.169.0.1, for instance, the subnet mask
is still valid, but cannot reach your DHCP server anymore. Refer to subnet mask documentation for
more details.
D
ESCRIPTION
: Unable to reach the Mediatrix 4104 after changing the Ethernet speed at run-time.

P
OSSIBLE
C
AUSE
: Some hubs cannot adapt completely their port speed at run-time.
S
OLUTION
: Always restart the Mediatrix 4104 for the new setting to take effect. See “Ethernet
Connection Speed” on page 161 for more details.
D
ESCRIPTION
: The Bypass feature does not activate if the SIP proxy times out when a call is initiated.

P
OSSIBLE
C
AUSE
: In SIP, there is no direct correlation between the user agent and the proxy. The user
agent may be able to complete outgoing calls without the help of the server, and may also receive calls
as well. The problem is thus normal. The SIP proxy going down is rather a network setup problem.
S
OLUTION
: To avoid those types of failures, the network should use redundant servers when possible.
D
ESCRIPTION
: Setting the MIB variable voiceIfAdaptativeJitterBufferEnable to disable has no effect.

P
OSSIBLE
C
AUSE
: You cannot disable the adaptative jitter buffer on the Mediatrix 4104.
S
OLUTION
: If you set the voiceIfTargetJitterBufferLength and voiceIfMaxJitterBufferLength variables to
the same value, you will have a non-adaptative jitter buffer. See “Adaptative Jitter Buffer” on page 241
for more details.
D
ESCRIPTION
: When I set values such as the User Name and Display Name, the value is not accepted and is
reset to its default value once the Mediatrix 4104 restarts.

P
OSSIBLE
C
AUSE
: When you enter values that contain non-standard English characters in entries that
accept strings of characters, this invalidates the value and resets it to its default value. However, this
may be visible only once the Mediatrix 4104 restarts.